[kwin] [Bug 510818] Dark blurs are significantly brighter than they were in Plasma 6.4

[medin]

https://bugs.kde.org/show_bug.cgi?id=510818

--- Comment #61 from medin <med.medin.2...@gmail.com> ---
Created attachment 186646
  --> https://bugs.kde.org/attachment.cgi?id=186646&action=edit
Blur not fixed Plasma Wayland 6.5.2

The blur is not yet fixed in Plasma Wayland 6.5.2, it looks the same brighter
gray color, see attached image for more info.


And kwin_wayland throws a number of errors in journald:


11/9/25 2:12 PM kwin_wayland    Failed to compile fragment shader: 
 "0:19(18): error: could not implicitly convert operands to arithmetic
operator\n0:19(17): error: operands to arithmetic operators must be
numeric\n\x00"
11/9/25 2:12 PM kwin_wayland    line 0:"uniform sampler2D texUnit;"
11/9/25 2:12 PM kwin_wayland    line 1:"uniform mat4 colorMatrix;"
11/9/25 2:12 PM kwin_wayland    line 2:"uniform float offset;"
11/9/25 2:12 PM kwin_wayland    line 3:"uniform vec2 halfpixel;"
11/9/25 2:12 PM kwin_wayland    line 4:""
11/9/25 2:12 PM kwin_wayland    line 5:"varying vec2 uv;"
11/9/25 2:12 PM kwin_wayland    line 6:""
11/9/25 2:12 PM kwin_wayland    line 7:"void main(void)"
11/9/25 2:12 PM kwin_wayland    line 8:"{"
11/9/25 2:12 PM kwin_wayland    line 9:"    vec4 sum = texture2D(texUnit, uv +
vec2(-halfpixel.x * 2.0, 0.0) * offset);"
11/9/25 2:12 PM kwin_wayland    line 10:"    sum += texture2D(texUnit, uv +
vec2(-halfpixel.x, halfpixel.y) * offset) * 2.0;"
11/9/25 2:12 PM kwin_wayland    line 11:"    sum += texture2D(texUnit, uv +
vec2(0.0, halfpixel.y * 2.0) * offset);"
11/9/25 2:12 PM kwin_wayland    line 12:"    sum += texture2D(texUnit, uv +
vec2(halfpixel.x, halfpixel.y) * offset) * 2.0;"
11/9/25 2:12 PM kwin_wayland    line 13:"    sum += texture2D(texUnit, uv +
vec2(halfpixel.x * 2.0, 0.0) * offset);"
11/9/25 2:12 PM kwin_wayland    line 14:"    sum += texture2D(texUnit, uv +
vec2(halfpixel.x, -halfpixel.y) * offset) * 2.0;"
11/9/25 2:12 PM kwin_wayland    line 15:"    sum += texture2D(texUnit, uv +
vec2(0.0, -halfpixel.y * 2.0) * offset);"
11/9/25 2:12 PM kwin_wayland    line 16:"    sum += texture2D(texUnit, uv +
vec2(-halfpixel.x, -halfpixel.y) * offset) * 2.0;"
11/9/25 2:12 PM kwin_wayland    line 17:""
11/9/25 2:12 PM kwin_wayland    line 18:"    gl_FragColor = (sum / 12) *
colorMatrix;"
11/9/25 2:12 PM kwin_wayland    line 19:"}"
11/9/25 2:12 PM kwin_wayland    line 20:""
11/9/25 2:12 PM kwin_wayland    line 21:""
11/9/25 2:15 PM systemd-coredump        Process 1678 (plasmashell) of user 1007
dumped core.

Stack trace of thread 1678:
#0  0x00007f79cf204f54 n/a (n/a + 0x0)
ELF object binary architecture: AMD x86-64

11/9/25 2:16 PM kwin_wayland    Failed to compile fragment shader: 
 "0:19(18): error: could not implicitly convert operands to arithmetic
operator\n0:19(17): error: operands to arithmetic operators must be
numeric\n\x00"
11/9/25 2:16 PM kwin_wayland    line 0:"uniform sampler2D texUnit;"
11/9/25 2:16 PM kwin_wayland    line 1:"uniform mat4 colorMatrix;"
11/9/25 2:16 PM kwin_wayland    line 2:"uniform float offset;"
11/9/25 2:16 PM kwin_wayland    line 3:"uniform vec2 halfpixel;"
11/9/25 2:16 PM kwin_wayland    line 4:""
11/9/25 2:16 PM kwin_wayland    line 5:"varying vec2 uv;"
11/9/25 2:16 PM kwin_wayland    line 6:""
11/9/25 2:16 PM kwin_wayland    line 7:"void main(void)"
11/9/25 2:16 PM kwin_wayland    line 8:"{"
11/9/25 2:16 PM kwin_wayland    line 9:"    vec4 sum = texture2D(texUnit, uv +
vec2(-halfpixel.x * 2.0, 0.0) * offset);"
11/9/25 2:16 PM kwin_wayland    line 10:"    sum += texture2D(texUnit, uv +
vec2(-halfpixel.x, halfpixel.y) * offset) * 2.0;"
11/9/25 2:16 PM kwin_wayland    line 11:"    sum += texture2D(texUnit, uv +
vec2(0.0, halfpixel.y * 2.0) * offset);"
11/9/25 2:16 PM kwin_wayland    line 12:"    sum += texture2D(texUnit, uv +
vec2(halfpixel.x, halfpixel.y) * offset) * 2.0;"
11/9/25 2:16 PM kwin_wayland    line 13:"    sum += texture2D(texUnit, uv +
vec2(halfpixel.x * 2.0, 0.0) * offset);"
11/9/25 2:16 PM kwin_wayland    line 14:"    sum += texture2D(texUnit, uv +
vec2(halfpixel.x, -halfpixel.y) * offset) * 2.0;"
11/9/25 2:16 PM kwin_wayland    line 15:"    sum += texture2D(texUnit, uv +
vec2(0.0, -halfpixel.y * 2.0) * offset);"
11/9/25 2:16 PM kwin_wayland    line 16:"    sum += texture2D(texUnit, uv +
vec2(-halfpixel.x, -halfpixel.y) * offset) * 2.0;"
11/9/25 2:16 PM kwin_wayland    line 17:""
11/9/25 2:16 PM kwin_wayland    line 18:"    gl_FragColor = (sum / 12) *
colorMatrix;"
11/9/25 2:16 PM kwin_wayland    line 19:"}"
11/9/25 2:16 PM kwin_wayland    line 20:""
11/9/25 2:16 PM kwin_wayland    line 21:""

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